Loveland police are asking for public assistance in locating a sexually violent predator who has failed to register as a sex offender with the state.

A press release from Loveland Police Department on Tuesday said 48-year-old John Proa is wanted on a felony warrant alleging failure to register as a sex offender. He was convicted of sex assault on a child in Arkansas in 2007, said Steve Watts, who manages LPD’s sex offender registry.

Proa has been classified as a sexually violent predator as outlined by the Colorado Bureau of Investigation.

Watts said Proa completed a prison sentence served outside of Colorado in 2016, and came to Loveland and registered as a sex offender on Dec. 9, 2016.

Watts said Proa maintained proper registration with the department until Sept. 7, Proa’s birthday. Sexually violent predators are required by state law to check in with local law enforcement on their birthdays, Watts said.

It's been 20 years this month since three people -- a 9-year-old girl, her dad, and a man who worked for him -- disappeared. Westminster investigators believe the trio were murdered and their bodies hidden.